Flange gaskets

Flange gaskets are used for pipe flange connections. They are the seals between the two flanges. The medium, pressure and temperature directly affect the selection of flange gaskets. Flange connections often use a variety of gaskets, which helps to improve the tightness of the joint.


Generally, the types of gaskets include graphite gaskets, metal gaskets, asbestos rubber gaskets, and the like. Three different types of flange gaskets also have different use characteristics. There are three types of stainless steel flange gaskets. Types and characteristics.


Metal gasket
The tooth profile is processed with helical corrugation on the flat gasket sealing surface-suitable for concave and convex flange sealing surfaces; octagonal and elliptical gaskets-suitable for trapezoidal groove flange sealing surfaces; lens gasket metal gaskets are used for lens flange sealing surfaces There are several materials to choose from, such as pure iron, very low carbon steel, stainless steel, and aluminum.


The sealing surface has high processing precision, large surface roughness, and high bolt pressing force. For high temperature and high pressure valves. Metal-coated graphite gaskets are made of thin metal-coated ring asbestos gaskets. It is generally used for the concave and convex sealing surface of the flange. Suitable for high temperature and pressure valves.


Asbestos rubber gasket
Asbestos rubber gasket is used for smooth flange sealing surface, embossed flange sealing surface and groove flange sealing surface of high temperature and medium pressure valve.


Its advantages are better corrosion resistance and thermal stability, good plasticity, tightness and less pressure. The disadvantage is that it is low in strength and easy to stick to the flange sealing surface. Asbestos rubber gaskets are multipurpose asbestos boards and anti-corrosive asbestos boards. They are usually made of asbestos boards, acid-resistant asbestos boards, oil-resistant asbestos boards and wire asbestos boards.


Graphite gasket
Graphite gaskets are flat gaskets made of soft graphite, suitable for high temperature and highly corrosive media. For groove sealing surfaces. It is mainly made of polytetrafluoroethylene and glass fiber polytetrafluoroethylene. Suitable for strong corrosive medium at low temperature and different pressure. Teflon gaskets, etc.


What needs to be emphasized here is that the flange gasket acts as a buffer at the connection, which can effectively avoid direct contact between the steel plates and prolong the service life of the flange.